package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;


public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {


    //因为SubjectExcelListener不能交给spring进行管理，需要自己new,不能注入其他对象
    //不能实现数据库操作
    public EduSubjectService subjectService;

    public SubjectExcelListener() {
    }

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //读取excel内容，一行一行进行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (subjectData == null) {
            throw new GuliException(20001, "文件数据为空");
        }
        //一行一行读取，每次读取两个值，第一个值是一级分类，第二个值是二级分类
        //判断一级分类是否重复
        EduSubject existOneEduSubject = existOneSubject(subjectData.getOneSubjectName());
        if (existOneEduSubject == null) {
            existOneEduSubject = new EduSubject();
            existOneEduSubject.setParentId("0");
            existOneEduSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneEduSubject);
        }

        //获取一级分类id值
        String pid = existOneEduSubject.getId();

        //添加二级分类
        EduSubject existTwoEduSubject = existTwoSubject(subjectData.getTwoSubjectName(), pid);
        if (existTwoEduSubject == null) {
            existTwoEduSubject = new EduSubject();
            existTwoEduSubject.setParentId(pid);
            existTwoEduSubject.setTitle(subjectData.getTwoSubjectName());
            subjectService.save(existTwoEduSubject);
        }
    }

    //判断一级分类不能重复添加
    private EduSubject existOneSubject(String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", "0");
        EduSubject subject = subjectService.getOne(wrapper);
        return subject;
    }

    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(String name, String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", pid);
        EduSubject subject = subjectService.getOne(wrapper);
        return subject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
